add Dockerfile

docker/Dockerfile

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+FROM php:7.0-apache
+
+# Install required PHP extensions
+RUN docker-php-ext-install mysqli
+
+VOLUME /var/www/html
+
+ENV POSTFIXADMIN_VERSION 3.1
+ENV POSTFIXADMIN_SHA512 3bda4e9d4a7308d22edca30d181af76b7153e57b19bda878e32f5eeeb49127f46581c966706bcca13cd31740cadacc584e15830aa157b4655e60d44d66f45ddd
+
+RUN set -eux; \
+	curl -o postfixadmin.tar.gz -SL "https://github.com/postfixadmin/postfixadmin/archive/postfixadmin-${POSTFIXADMIN_VERSION}.tar.gz"; \
+	echo "$POSTFIXADMIN_SHA512 *postfixadmin.tar.gz" | sha512sum -c -; \
+	# upstream tarball include ./postfixadmin-postfixadmin-${POSTFIXADMIN_VERSION}/
+	tar -xzf postfixadmin.tar.gz -C /usr/src/; \
+	mv /usr/src/postfixadmin-postfixadmin-${POSTFIXADMIN_VERSION} /usr/src/postfixadmin; \
+	rm postfixadmin.tar.gz; \
+	# Does not exist in tarball but is required
+	mkdir -p /usr/src/postfixadmin/templates_c; \
+	chown -R www-data:www-data /usr/src/postfixadmin
+
+COPY docker-entrypoint.sh /usr/local/bin/
+
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
+CMD ["apache2-foreground"]

docker/docker-entrypoint.sh

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+#!/bin/bash
+set -ex
+
+if [[ "$1" == apache2* ]] || [ "$1" == php-fpm ]; then
+	if ! [ -e index.php -a -e scripts/postfixadmin-cli.php ]; then
+		echo >&2 "Postfixadmin not found in $PWD - copying now..."
+		if [ "$(ls -A)" ]; then
+			echo >&2 "WARNING: $PWD is not empty - press Ctrl+C now if this is an error!"
+			( set -x; ls -A; sleep 10 )
+		fi
+		tar cf - --one-file-system -C /usr/src/postfixadmin . | tar xf -
+		echo >&2 "Complete! Postfixadmin has been successfully copied to $PWD"
+	fi
+
+	if [ -n "${!MYSQL_ENV_MYSQL_*}" ]; then
+		: "${POSTFIXADMIN_DB_TYPE:=mysqli}"
+		: "${POSTFIXADMIN_DB_HOST:=mysql}"
+		: "${POSTFIXADMIN_DB_USER:=${MYSQL_ENV_MYSQL_USER:-root}}"
+		if [ "$POSTFIXADMIN_DB_USER" = 'root' ]; then
+			: "${POSTFIXADMIN_DB_PASSWORD:=${MYSQL_ENV_MYSQL_ROOT_PASSWORD}}"
+		else
+			: "${POSTFIXADMIN_DB_PASSWORD:=${MYSQL_ENV_MYSQL_PASSWORD}}"
+		fi
+		: "${POSTFIXADMIN_DB_NAME:=${MYSQL_ENV_MYSQL_DATABASE:postfix}}"
+	fi
+
+	if [ ! -e config.local.php ]; then
+		touch config.local.php
+		echo "Write config to $PWD/config.local.php"
+		echo "<?php
+		\$CONF['database_type'] = '${POSTFIXADMIN_DB_TYPE}';
+		\$CONF['database_host'] = '${POSTFIXADMIN_DB_HOST}';
+		\$CONF['database_user'] = '${POSTFIXADMIN_DB_USER}';
+		\$CONF['database_password'] = '${POSTFIXADMIN_DB_PASSWORD}';
+		\$CONF['database_name'] = '${POSTFIXADMIN_DB_NAME}';
+
+		\$CONF['setup_password'] = '${POSTFIXADMIN_SETUP_PASSWORD}';
+
+		\$CONF['configured'] = true;
+		?>" | tee config.local.php
+	else
+		echo "WARNING: $PWD/config.local.php already exists."
+		echo "Postfixadmin related environment variables have been ignored."
+	fi
+fi
+
+exec "$@"